Re: Not my field of expertise
>>> once you've "forgotten" about somebody, how do you remember to forget them on a restore?
Tag the data subject records with a unique identifier (a meaningless but unique number - MBUN). When I forget someone and delete the records that MBUN is no longer linked to a an identity, Keep a list of all the MBUN identifiers whose records you forgot - when you restore delete any records on my MBUN list.
Of course encrypt my backups - many authorities consider that in the event of a breach encrypted data is not a disclosure since the risk of re-identification is very small. Whether all this is sufficient is open to guidance and findings by individual DPAs but may well be a defensible position and unlikely to incur a huge fine.