Unsure it's the best place to ask, anyway:
I know symmetric encryption is the best for such tasks but I am planning to encrypt large backup files (between 10 and 100GB) with my private PGP key. My purpose here is to use several layers of encryption, each of them using a different algorithm to prevent 0day exploits on a specific algorithm. So you get me: AES first then RSA.
I have just tried to perform the above and while there is absolutely no problem with AES (takes about 20min on my file just using 7zip), PGP (using gpg4win / kleopatra) is taking a while until a time out message stops the process after more than 30min (I wasn't timing maybe it was an hour or two).
I have read there is no specific limit to file size for PGP encryption or it may be related to your memory size but nothing clear. Would you have more information about this?