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Upgrade disk without performing a new full backup

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I would like to upgrade the drives of my computer, but maintain my backup history and continue incremental backups. Is that possible? In detail:

I have an internal M.2 SSD and an external SSD connected by USB for pictures etc. Apart from the daily backup to a USB hard drive (which I rotate once a week and where I do a full backup every 20 days, otherwise incremental), I also have a backup that runs once a week and is only incremental. This allows me to go back to any week in the last three years in case I suddenly notice that an important file has been corrupted 6 months ago and I did not notice immediately. The backup of the internal disk is a drive backup, the external disk uses file backup.

Is it possible to replace the disks, restore or copy the old data, and then continue this long-time incremental backup without doing a full backup from scratch (i.e. without losing history and without wasting 6TB on my backup drive just for copying all of the restored files again)? If yes, how would I do that?

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What sort of backup are you running; Files & Folders or Disk and Partitions"?

Ian

Is it possible to replace the disks, restore or copy the old data, and then continue this long-time incremental backup without doing a full backup from scratch (i.e. without losing history and without wasting 6TB on my backup drive just for copying all of the restored files again)? If yes, how would I do that?

Yes, it is possible but you would need to reselect the Source drive(s) for your backup task(s) after doing the disk replacement / migration to new / larger drives.  I have done this myself a number of times when upgrading the size of my main OS SSD (128GB >> 500GB >> 1TB >> 2TB).

Apart from the daily backup to a USB hard drive (which I rotate once a week and where I do a full backup every 20 days

See KB 62741: Acronis True Image: rotating backup destination disks requires separate backup plans per destination disk