More than a factor 10 for a single song. For 50 songs that would become 2Gb. I love flac as a format but i would never recommend it as a general format for my grandmother.
I was suffering from low disk space for a few years and then happened to notice last month that 2TB NVME SSDs are $75-$125 depending on speed. They are all much faster than an old drive.
If you haven't looked in five years (like myself) I recommend doing that. No one needs to suffer on short disk space any longer. Don't know what "grandma" uses but it is unlikely that audio is a significant burden anymore when people routinely shoot HD+ video.
Also if compressing, Opus sounds better and is smaller.
A 1TB microsd card can store 2-3000 CDs worth of FLAC files. Or an 8TB SATA SSD can store 10s of thousands of CDs. You basically can't fill up a modern drive with (legally acquired) music.
A 1TB MicroSD card is still like $100 compared to getting a 64GB for like $3. I'd prefer to save $97 and delete some data that I probably won't even notice. I'll also get better battery life when picking a codec which my device has hardware decoders for.
And I get that the 1TB for $100 is cheaper per gig, but if I never even needed those gigs in the first place my overall cost is still cheaper to get the $3 one.
Yanni Rainmaker Flac -> 40 MB Yanni Rainmaker Mp3 -> 3MB
More than a factor 10 for a single song. For 50 songs that would become 2Gb. I love flac as a format but i would never recommend it as a general format for my grandmother.