@zoul oh boy, you can connect it to backblaze and I have a good link by @ricard about managing the content to limit your disk usage. For reference, I'm using 300 gb in backblaze right now and it costs me $2.50 a month.
Here's the article about preserving disk space once you have CLI access (MastoHost doesn't allow CLI access or backblaze connection because they're overcharging for those commodities)