I also want my trees to outlive me, both my Jewish one or ones and my husband's non-Jewish ones.  I am planning on at least one book for his tree and possibly one for mine.  I do however have my own website - and the wayback machine should archive it.   I do pay for hosting, but a google search will turn up free hosting.   My site uses TNG and that is a one time charge for the software that is installed on the server.  Another option is to do a free trial of Ancestry.com and upload your trees there.  They will not be changed.
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Sarah L Meyer
Georgetown TX
ANK(I)ER, BIGOS, KARMELEK, PERLSTADT, STOKFISZ, SZPIL(T)BAUM, Poland
BIRGARDOVSKY, EDELBERG, HITE (CHAIT), PERCHIK Russia (southern Ukraine) and some Latvia or Lithuania
https://www.sarahsgenies.com