Hi, Officially, yes. Unofficially, it all depends on how much data you currently have. Each of your externals may hold up to a TB, but how much data is actually stored on them? Add up the amount of data, then multiply it by 1.5. If that is more than 4 TB, then you're probably able to use the 4 TB HD as your backup drive. If your total without multiplication is already over 4 TB, then you're out of luck. You cannot back up 6 TB onto a 4 TB drive no matter what solution you find. Compression won't help. You might be able to use a combination of solutions. That is, use iCloud Drive to store your Desktop and Documents folder from the computer itself, then use the 4 TB drive just to back up the externals. Either way, if you do have 8 TB of actual data, then you need 12 to 16 TB of available space to do a reliable backup. Realize that the first backup would likely be 10 to 11 TB on an 8 TB source, then you need free space for subsequent backups. Otherwise, you're just keeping a backup for a very short time and the older data is purged very quickly, which makes your recovery options very limited.
Later... Tim Kilburn Apple Teacher (with Swift Playgrounds Recognition) Fort McMurray, AB Canada On Dec 16, 2018, at 02:49, Ramy Moustafa <ramy.moustaf...@gmail.com> wrote: Aha i understand now. but all my external HDs will be more than 4 TB, and i will not be able to buy 8 TB HD. All my data now are 8 TB storage, so, must i buy 16 TB hard drive? so, what will be teh 2nd solution? > On Dec 14, 2018, at 4:31 PM, 'Tim Kilburn' via MacVisionaries > <macvisionaries@googlegroups.com <mailto:macvisionaries@googlegroups.com>> > wrote: > > Hi, > > No, it can be just one backup volume. First limitation is that the backup > volume should be about twice as big as the data being stored. So, if you > have less than 2 TB of data that needs backed up, then a 4 TB Time Machine > backup volume is perfect. If the total is greater than that, you might be > fine, but the backup may run out of space too quickly. All that out of the > way, you just go into your Time Machine pane in System Prefs, press the > Options button and make sure that none of your external drives are excluded > from the backup. Essentially, that's all you need to do. Leave all drives > connected all the time and let Time Machine do its thing automatically. Note > that the first backup may take days as the data is being prepared for and > backed up to the new drive. All subsequent backups should be much faster. > > Later... > > Tim Kilburn > Apple Teacher > (with Swift Playgrounds Recognition) > Fort McMurray, AB Canada > > On Dec 14, 2018, at 06:32, Ramy Moustafa <ramy.moustaf...@gmail.com > <mailto:ramy.moustaf...@gmail.com>> wrote: > > > > My friends: > I finally got 4 tb hard disk, that i plan to use it for weekly backup, > I have more than 3 hard disks that i hope to backup them on this hd, so, must > i divide this new hd to 3 volumes to use time machines? > or what is the best thing? > Thanks for helping.Ramy moustafa saber > licturer at: > faculty of musical education > music arranger and sound engineer > Sent from my iPhone > > -- > The following information is important for all members of the Mac Visionaries > list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your Mac Visionaries list moderator is Mark Taylor. 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