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<blockquote data-quote="bobtomay" data-source="post: 1631182" data-attributes="member: 24160">???CCC and SD! make bootable clones - an exact copy of the drive you are copying.&nbsp; Neither of them do Time Machine type backups which keep old deleted stuff.&nbsp; The backup used space is going to be the same (or approximately the same) as the used space on the drive you are copying from.&nbsp; The backup is not going to use more space than the amount of used space on the drive you are copying from.&nbsp; The size of the external bootable clone drive you need will be determined by the amount of used space on the drive you are copying from.&nbsp; e.g. If the internal drive is using 500 GB, the backup will use 500 GB of space.&nbsp; If you end up with 760 GB used space internally, you can delete the old backup and reformat all you want and you will still never be able to use your current 750 GB external to back up that 1 TB internal drive.I will also recommend maintaining the same 20% &quot;minimum&quot; free space on the backup as I recommend to most users on the internal drive.I personally keep all my hard drives that contain a bootable OS at 35% absolute bare minimum free space.</blockquote>

[QUOTE="bobtomay, post: 1631182, member: 24160"] ??? CCC and SD! make bootable clones - an exact copy of the drive you are copying. Neither of them do Time Machine type backups which keep old deleted stuff. The backup used space is going to be the same (or approximately the same) as the used space on the drive you are copying from. The backup is not going to use more space than the amount of used space on the drive you are copying from. The size of the external bootable clone drive you need will be determined by the amount of used space on the drive you are copying from. e.g. If the internal drive is using 500 GB, the backup will use 500 GB of space. If you end up with 760 GB used space internally, you can delete the old backup and reformat all you want and you will still never be able to use your current 750 GB external to back up that 1 TB internal drive. I will also recommend maintaining the same 20% "minimum" free space on the backup as I recommend to most users on the internal drive. I personally keep all my hard drives that contain a bootable OS at 35% absolute bare minimum free space. [/QUOTE]

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