A spike in subscribers for a period doesn't necessarily mean they're making more money than before, even if the number of new signups offsets the cancellations.
I used to pay for the Premium plan, sharing with my parents, but downgraded to the Basic plan. My parents ended up getting their own Basic plan. So a single account essentially split into two, but the sum of both payments is now less than what it used to be for the single account. So Netflix gained an extra subscriber, but is now making less money from that pool of users.
It's totally possible that some number of these new signups consist of people who did the same thing. It could even be that some number of these new signups are people who joined because others who were sharing with them closed their own accounts.
Basically, seeing a spike in new signups isn't itself a measure of success.
I run all of my services in containers, and intentionally leave my Docker host as barebones as possible so that it's disposable (I don't backup anything aside from data to do with the services themselves, the host can be launched into the sun without any backups and it wouldn't matter). I like to keep things simple yet practical, so I just run a nightly cron job that spins down all my stacks, creates archives of everything as-is at that time, and uploads them to Wasabi, AWS S3, and Backblaze B2. Then everything just spins back up, rinse and repeat the next night. I use lifecycle policies to keep the last 90 days worth of backups.