If I use winrar to compress 80gb of tv and movies.
You haven't gained anything by doing so since video is already compressed. Compressing data that is already compressed will usually make it slightly larger - or if you're lucky maybe you'll save like 1 megabyte space, not really anything worth the trouble.
Then can I compress it further by making it an iso?
ISO is not compression.
To view blocked instances if you're browsing Lemmy on the desktop website go to https://lemmy.world/instances and click the "Blocked Instances" tab.
Unfortunately there no standard way to view blocked communities, I'm not sure if lemmy.world admins maintain a list somewhere.
I'll add that the blocked stuff is good/bad depending on your point of view. e.g. some instances (including lemmy.world) participate in Fediseer which helps determine spammy intances to potentially block and keep spam out. That sort of blocking is okay, the other types of blocking I'm not too onboard with but that's just IMO.
PS - If you're just starting out probably best not to overthink it too much :) As you get more comfortable browsing the Fediverse you can decide later on if you want to set yourself up on another instance.
Sometimes the instance you are on will block communities or other instances that you may still want to be able to view/browse.. in those cases your only solution is to create a new Lemmy account at a different instance that does not block those things.
For example you're on lemmy.world so all your blocked instances are listed at https://lemmy.world/instances
In addition lemmy.world admins also block entire communities e.g. blocking all piracy related communities is a big one there https://lemmy.world/post/13320356
Bra gun too, there was the woman that shot herself in the head while adjusting a gun in her bra
https://www.cbsnews.com/news/police-woman-fatally-shot-self-while-adjusting-bra-holster/
If you haven't already visited you definitely should! I never had the chance to live there but did spend a couple of weeks visiting and it was awesome. Reykjavik, driving the ring road, all those cliffs, waterfalls, national parks, it's all great. That was before this Lemmy bar existed otherwise I would've visited that too.
I've too wondered how feasible it would be to relocate and/or retire to Iceland but that seems pretty far off from reality.
That has never crossed my mind, I'm thinking heavy metal when I think about Lemmy Kilmister / Lemmy.
But I do think lemmings are cute, and that old video game was awesome, so it all sort of works for me :D
I've definitely re-watched old Adult Swim stuff. Aqua Teen Hunger Force and Sealab 2021 in particular. (I need to include Harvey Birdman Attorney At Law in that mix)
Zip bombs wouldn't apply here, from what I understand to create those you'd have to start with uncompressed data. The typical example is using a bunch of zeroes as the starting point, not only is that compressible but the compression algorithm will look for redundancies in the data to increase the compression efficiency (a bunch of zeroes would have tons of redundancy).
Stackoverflow has a good discussion on it https://stackoverflow.com/questions/1459673/how-does-one-make-a-zip-bomb