Trim size of backup storage when only 1 single full backups exists

We have Vembu Free Edition 3.9.1 [3912018060720] and it was configured back in 2018 to perform a single backup and has been performing incremental backups ever since. This has been eating away at disk space and we are now getting very short.

I would like to know the best way to remove some of the data, we only need to have the last year available but I don't want to manually delete any files in case this stops us performing an restores.

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