I have done a lot of old family photos & always scan in pictures we are sent (like in Christmas cards or for announcements). For the cards, I usually take a picture of them with my phone because I know I'm not going to likely want a large print of it and most of them are good prints now that are clear.
For the old family photos, I use a scanner (I had a flatbed one but usually just the printer/scanner combo now) and set the dpi to the highest it will, I add multiple photos if they fit and scan. Yes a bit time consuming but it does a good job. I often will do it while working on other things so while it takes a bit for each scan I'm getting other things worked on
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